Question $1$

Consider the code:

deff$(x)$ :

$"$ Pre: $x$ is a natural number ${?}^{\text{'}\text{'}\text{'}}$

$a=x$

$y=10$

while $a>0$ :

$a=a-y$

$y=y-1$

return $a*y$

From the following select the correct answer.

Answer

a$.$ This function has an incorrect precondition.

b$.$ This function always terminates.

c$.$ This function always returns a positive value.

d$.$ This function never terminates.